Oxford vs. Harvard: Please help me decide...

Hey everybody,
I know it sounds fucking cocky and like the biggest first-world-problem of all and I don't mean to be arrogant, but I got admitted to Oxford (PPE) as well as Harvard and I don't know where I should go.
Both are great opportunities, but definitely have their pros and cons, and it's incredibly hard for me to make up my mind about it.
I'd love to hear your advice/opinions on this decision. What would you do? What would you prefer?

For background: I'm an international applicant from Germany.
Thanks in advance :)